I have a very short Python program that runs on one of my Raspberry
Pis to collect temperatures from a 1-wire sensor and write them to a
database:-
#!/usr/bin/python3
#
#
# read temperature from 1-wire sensor and store in database with date and
time
#
import sqlite3
import time
ftxt = str(open("/sys/bus/w1/devices/28-01204e1e64c3/w1_slave").read(100))
temp = (float(ftxt[ftxt.find("t=") +2:]))/1000
#
#
# insert date, time and temperature into the database
#
tdb = sqlite3.connect("/home/chris/.cfg/share/temperature/temperature.db")
cr = tdb.cursor()
dt = time.strftime("%Y-%m-%d %H:%M")
cr.execute("Insert INTO temperatures (DateTime, Temperature) VALUES(?,
round(?, 2))", (dt, temp)
)
tdb.commit()
tdb.close()
It's run by cron every 10 minutes.
At 03:40 last night it suddenly started throwing the following error every
time it ran:-
Fatal Python error: initfsencoding: Unable to get the locale encoding
LookupError: unknown encoding: UTF-8
Current thread 0xb6f8db40 (most recent call first):
Aborted
Running the program from the command line produced the same error.
Restarting the Pi system has fixed the problem.
What could have caused this? I certainly wasn't around at 03:40! :-)
There aren't any automatic updates enabled on the system, the only
thing that might have been going on was a backup as that Pi is also
my 'NAS' with a big USB drive connected to it. The backups have been
running without problems for more than a year. Looking at the system
logs shows that a backup was started at 03:35 so I suppose that *could*
have provoked something but I fail to understand how.
--
Chris Green
ยท
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